Oxygen becomes part of cellular respiration _________________.
A.
at the end of glycolysis
B.
at the end of the electron transport chain
C.
at the end of fermentation
D.
at the end of the Krebs cycle
At the end of the electron transport chain when electrons & H+ & O2 combine. Oxygen is the final electron acceptor.
A. at the end of glycolysis
b. is the right answer
Im not completely sure of the answer but im pretty sure its B.
The correct answer is B. Oxygen becomes part of cellular respiration at the end of the electron transport chain.
To understand why, let's first talk about cellular respiration. Cellular respiration is the process by which cells convert glucose (a sugar) into usable energy in the form of ATP (adenosine triphosphate). It can be divided into three main stages: glycolysis, the Krebs cycle (also known as the citric acid cycle), and the electron transport chain.
During glycolysis, glucose is broken down into smaller molecules called pyruvate. This process occurs in the cytoplasm of the cell and does not require oxygen.
The pyruvate molecules then enter the mitochondria, where they undergo further breakdown in the Krebs cycle. This cycle generates some ATP and high-energy electrons (in the form of NADH and FADH2) that will be used in the final stage of cellular respiration.
The final stage, the electron transport chain, takes place on the inner membrane of the mitochondria. This is where oxygen becomes involved. The high-energy electrons generated in the Krebs cycle are transferred along a series of protein complexes in the electron transport chain. As the electrons move through these complexes, energy is released and used to pump protons (H+) across the mitochondrial membrane.
Finally, the oxygen we breathe comes into play. At the end of the electron transport chain, oxygen acts as the final electron acceptor. It combines with the electrons and protons to form water (H2O), completing cellular respiration. In the absence of oxygen, the electron transport chain cannot function properly, leading to a decrease in ATP production and an accumulation of NADH.
So, to summarize, oxygen becomes part of cellular respiration at the end of the electron transport chain.